Crypto decrypt functions now return by reference. See #10
[PHPCredLocker.git] / lib / crypto.php
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<?php
/** Crypto Functions
*
* Copyright (C) 2012 B Tasker
* Released under GNU GPL V2
* See LICENSE
*
*/
defined('_CREDLOCK') or die;
 
class Crypto{
 
protected $keys;
protected $cipher;
 
 
public $safety = 1;
 
/** Load the Crypto Settings
*
*/
protected function loadConfig(){
if (!isset($this->keys)){
require 'conf/crypto.php';
$this->keys = $crypt;
$this->cipher = $cipher;
}
}
 
 
 
/** Add a key to the config file
*
* @arg newkey string
* @arg newtype - string
*
* @return
*/
function addKey(&$newkey,$newid){
 
 
$this->loadConfig();
 
// Trim to the required keylength
$newkey = substr( $newkey, 0,$this->cipher->keyLength);
 
 
   $cryptconf = fopen(getcwd() . '/conf/crypto.php','a');
          
          
 
 
$str = "\n\$crypt->Cre$newid = '" . str_replace("'",'"',$newkey) . "';\n";
 
fwrite($cryptconf,$str);
        
 
 
unset($newkey);
unset($str);
fclose($cryptconf);
return true;
}
 
 
 
 
/** Pass string to configured engine for encryption
*
* @arg string - plaintext string to encrypt
* @arg type - String - Defines the type of string to decrypt (ServerCred, CustomerName etc)
*
* @return string - Ciphertext
*
*/
function encrypt(&$string,$type,$key = null){
$this->loadConfig();
 
 
    if ($this->cipher->Engine == 'auto'){
 
          if (function_exists('openssl_encrypt')){
          $this->cipher->Engine = 'OpenSSL';
          }else{
          $this->cipher->Engine = 'Mcrypt';
          }
    }
 
$fn = "encrypt_{$this->cipher->Engine}";
 
 
 
  if ($type != 'ONEWAY'){
    $ciphertext = $this->$fn($string,$type);
 
      if ($this->safety == 1){
      unset($this->keys);
      }
  }else{
  unset($this->keys);
  $this->keys->ONEWAY = $key;
  $ciphertext = $this->$fn($string,$type);
 
  }
return $ciphertext;
}
 
 
 
/** Encrypt the string using OpenSSL 
*
* @arg string string
* @arg type INT
*
* @return ciphertext string
*/ 
function encrypt_OpenSSL(&$string,$type){
return openssl_encrypt($string, $this->cipher->OpenSSL->Cipher, $this->keys->$type);
}
 
 
function encrypt_doubleROT13($string,$type){ return "If you've enabled this, you really shouldn't be in charge of Crypto Settings!"; }
 
 
/** Encrypt the string using MCrypt
*
* @arg string string
* @arg type INT
*
* @return ciphertext string
*/ 
function encrypt_Mcrypt(&$string,$type){
 
return mcrypt_encrypt($this->cipher->MCrypt->Encryption,$this->keys->$type,$string, $this->cipher->MCrypt->mode);
}
 
 
/** Pass ciphertext to the configured engine for decryption
*
* @arg string string
* @arg type INT
*
* @return plaintext string
*/ 
function decrypt($ciphertext,$type){
$this->loadConfig();
 
 if ($this->cipher->Engine == 'auto'){
 
          if (function_exists('openssl_encrypt')){
          $this->cipher->Engine = 'OpenSSL';
          }else{
          $this->cipher->Engine = 'Mcrypt';
          }
    }
 
 
$fn = "decrypt_{$this->cipher->Engine}";
$plaintext = $this->$fn($ciphertext,$type);
 
 
  if ($this->safety == 1){
  unset($this->keys);
  }
 
 
return $plaintext;
}
 
 
 
/** Decrypt ciphertext using OpenSSL
*
* @arg string string
* @arg type INT
*
* @return plaintext string
*/
function decrypt_OpenSSL($string,$type){
return openssl_decrypt($string, $this->cipher->OpenSSL->Cipher, $this->keys->$type);
}
 
 
 
/** Decrypt ciphertext using Mcrypt
*
* @arg string string
* @arg type INT
*
* @return plaintext string
*/
function decrypt_Mcrypt($ciphertext,$type){
return mcrypt_decrypt($this->cipher->MCrypt->Encryption,$this->keys->$type,$ciphertext, $this->cipher->MCrypt->mode);
}
 
 
 
 
 
 
}
 
 
 
 
 
 
 
 
 
 
 
?>